op {
  name: "ConcatOffset"
  input_arg {
    name: "concat_dim"
    type: DT_INT32
  }
  input_arg {
    name: "shape"
    type: DT_INT32
    number_attr: "N"
  }
  output_arg {
    name: "offset"
    type: DT_INT32
    number_attr: "N"
  }
  attr {
    name: "N"
    type: "int"
    has_minimum: true
    minimum: 2
  }
}
